Guard for set-screws.



J. PARR.

GUARD FOR SET SCREWS.

APPLIGATION FILED JAN-15, 1909.

949,087. Patented Feb. 15, 1910.

y S L JOHN PARB, or MARION, OHIO.

GUARD FOR SET-SCREWS.

alaosv.

Specification of Letters Patent.

Patented Feb. 15, 1910.

Application filed January 15, 1909. Serial No. 472,479.

To all whom it may concern:

Be it known that I, JOHN PARR, citizen of the United States, residing atMarion, in the county of Marion and State of Ohio, have invented certainnew and useful Improvements in Guards for Set-Screws, of which thefollowing is a specification.

The object of this invention is an improved device which is designed tobe applied to a shaft to prevent a projecting set screw from catchingthe clothing of a bystander when the shaft is rotating. And a furtherobject of the invention is a device of the character described which maybe readily applied to shafts of difiierent sizes and which does notinterfere with the adjustment of the set screw.

With these and other objects in view that will more fully appear as thedescription proceeds, the invention consists in certain constructionsand arrangements of parts that I shall hereinafter fully describe andclaim.

For a full understanding of the invention and the merits thereof,reference is to be had to the following description and the accompanyingdrawing, in which:

Figure 1 is a longitudinal section of my improved set screw showing itapplied, and, Fig. 2 is a transverse section thereof.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawing by the samereference characters.

Referring to the drawing, A designates a shaft to which my invention isapplied and upon which is mounted a bearing collar B that is heldrigidly in position by a set screw C, the head 0 of said set screwprojecting outwardly from the collar and being preferably square incross section in order that the set screw may be readily turned by awrench.

My improved device embodies a rim 1 that encircles the shaft A and thecollar B and that is spaced therefrom as shown with a portion of itsinner surface bearing against the head 0 of the set screw 0. In order tosustain the rim in this spaced relation, the latter is provided with aplurality of radiall and inwardly extending socket members 2 1n whichare mounted for longitudinal movement plungers 3 that are formed attheir inner ends with laterally enlarged heads 4, said heads beingformed with pins or teeth 5 projecting inwardly therefrom. Expansionsprlngs 6 encircle the socket members with one end bearing against theinner surface of the rim 1 and the other end against the heads of theplungers 3, whereby to force the latter inwardly with the pins 5 thereofbearing against the collar and preferably received in depressions formedin the periphery thereof. In order to further secure the rim in properspaced relation to the collar and to hold the rim in alinement with theset screw C, said rim is secured to the-latter by any suitable means. Inthe present instance the rim is formed with an aperture 7 in registrywith a threaded opening 8 in the head 0 of the set screw, and a rimscrew 9 is mounted in said aperture and said opening and holds the rimsecurely in an operative position. It will be noted that by thisarrangement when it is desired to manipulate the set screw, it is onlynecessary to loosen the rim screw to permit the former to be readily andconveniently turned.

From the above description in connection with the accompanying drawing,it will be seen that I have provided a simple, durable and efficientconstruction of device of the character described the use of which isobvious.

Having thus described the invention, what I claim is:

1. A set-screw guard comprising a rim provided with a plurality ofsocket members projecting radially inwardly therefrom, and plungersslidably mounted in the respective socket members and spring-pressedinwardly beyond the same and provided at their inner ends with engagingmeans.

2. A set-screw guard comprising a rim having a plurality of socketmembers disposed thereon and projecting radially inwardly therefrom,plungers slidably mounted in the respective socket members and formed attheir inner ends with laterally enlarged heads carrying engaging means,and expansion springs encircling the socket members and interposedbetween the rim and the heads to project the plungers inwardly.

3. A set screw guard comprising a rim adapted to encircle a shaft, and aplurality of radially disposed plungers slidably connected to the rimand inwardly springpressed to hold the same in position on the shaft.

4. A set screw guard comprising a rim having a plurality of socketmembers projecting inwardly therefrom, plungers slidably mounted in therespective socket members and formed at their inner ends with laterallyenlarged heads having central longitudinal projections, and springsencircling the socket members and interposed between i screw, meansinterposed between the rim and the rim and the heads to slide theplungers i x the shaftfor yieldingly supporting the former from thelatter, and means for detachably fixing the rim to the set screw.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN FARR.

inwardly.

5. The combination with a shaft having a set screw outstandingtherefrom, of a guard of the character described comprising a rimsurrounding the shaft in spaced relation thereto and extending outsideof the set Vitnesses H. E. SAMPSON, H. EDMUND HILL.

